This review of the Wii version of the game was originally published at Kombo.com on December 2, 2008.
Sonic Unleashed begins where most Sonic games end. Dr. Robotnik has put his latest plan at conquering the world in order to build his own Eggmanland into motion, but Sonic had found the seven Chaos Emeralds and is rapidly racing through the doctor's latest badniks. Sonic turns Super and smashes his way through a robotic blockade, but the doctor's fallback plan captures Sonic, drains the Chaos Emeralds of their power, and transforms Sonic into a monstrous feral beast. Oh, and the planet below splits open and releases an evil force destined to doom mankind. Sonic is ejected into space where he falls back to the planet and apparently lands on a mysterious little critter that has no memories of himself or his place in the world. Sonic and his new friend (named Chip after the little guy's craving for all things chocolate) have to travel the globe to revive the Chaos Emeralds and put the planet back together before Robotnik can completely take over.
Unleashed is basically divided into three types of gameplay. The game's primary levels are locked at the start of the adventure. Players will have to talk to villagers around the world to learn the location of the actual gameplay. Sometimes Sonic will encounter a daylight stage which is what we've come to expect from Sonic the Hedgehog game: blue skies, branching paths through which to run, enemies to smash, rings to collect, and everything else that makes the really good parts of the Sonic experience so joyful. The idea is to race to the goal ring as quickly as possible. Each daylight level alternates between 3D camera-behind-Sonic segments and, in a nice twist that reminds me of Sonic games of the 16-bit era, 2D sidescrolling levels with the camera turned perpendicular to our hero. However, at night Sonic transforms into the beast and must punch and slam his way through contained environments full of creatures made of dark energy. The objective is still to reach the goal ring, but now Sonic moves very slowly and is built more for savage beatdowns than raw speed.